/* style */
.drag-box{width:100%;height:100%;position:relative}
.drag-box select{width:100%;color:#000;min-height:28px;z-index:199; position:absolute;left:0;top:0;overflow: scroll;}
.drag-box .btn.btn-info.btn-xs{min-width:40px;width:45%}
.drag-box .drag{width:100px;height:100px;}
.drag-box .drag span{display:none;position:absolute;width:8px;height:8px;cursor:nw-resize;right:0;bottom:0;z-index:299}
.drag-box .drag:hover span{display:block;}
.drag-box .drag ul{ width:100%; height:100%; padding:0; margin:0; position:relative}
.drag-box .drag li{list-style:none;position:absolute;right:5px;bottom:5px; cursor:pointer;-webkit-user-select:none;-moz-user-select:none;-o-user-select:none;user-select:none;}
.drag-box .handler{background:#333;color:#fff;text-align:center;font-size:12px;line-height:20px;}
.drag-box .drag div{position:absolute;bottom:0;left:0;width:100%;text-align:center;z-index:99}
/* 当点击拖动时，保证当前元素处于前端 */
.drag-box .drag.going{z-index:9;}